Commit | Line | Data |
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252b5132 | 1 | /* Support for 32-bit Alpha NLM (NetWare Loadable Module) |
0f867abe AM |
2 | Copyright 1993, 1994, 2000, 2001, 2002, 2003 |
3 | Free Software Foundation, Inc. | |
252b5132 RH |
4 | Written by Ian Lance Taylor, Cygnus Support. |
5 | ||
6 | This file is part of BFD, the Binary File Descriptor library. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | /* This file describes the 32 bit Alpha NLM format. You might think | |
23 | that an Alpha chip would use a 64 bit format, but, for some reason, | |
24 | it doesn't. */ | |
25 | ||
26 | #include "bfd.h" | |
27 | #include "sysdep.h" | |
28 | #include "libbfd.h" | |
29 | ||
30 | #define ARCH_SIZE 32 | |
31 | ||
32 | #include "nlm/alpha-ext.h" | |
33 | #define Nlm_External_Fixed_Header Nlm32_alpha_External_Fixed_Header | |
34 | ||
35 | #include "libnlm.h" | |
36 | ||
b34976b6 | 37 | static bfd_boolean nlm_alpha_backend_object_p |
252b5132 | 38 | PARAMS ((bfd *)); |
b34976b6 | 39 | static bfd_boolean nlm_alpha_write_prefix |
252b5132 | 40 | PARAMS ((bfd *)); |
b34976b6 | 41 | static bfd_boolean nlm_alpha_read_reloc |
252b5132 | 42 | PARAMS ((bfd *, nlmNAME(symbol_type) *, asection **, arelent *)); |
b34976b6 | 43 | static bfd_boolean nlm_alpha_mangle_relocs |
0f867abe | 44 | PARAMS ((bfd *, asection *, const PTR, bfd_vma, bfd_size_type)); |
b34976b6 | 45 | static bfd_boolean nlm_alpha_read_import |
252b5132 | 46 | PARAMS ((bfd *, nlmNAME(symbol_type) *)); |
b34976b6 | 47 | static bfd_boolean nlm_alpha_write_import |
252b5132 | 48 | PARAMS ((bfd *, asection *, arelent *)); |
b34976b6 | 49 | static bfd_boolean nlm_alpha_set_public_section |
252b5132 RH |
50 | PARAMS ((bfd *, nlmNAME(symbol_type) *)); |
51 | static bfd_vma nlm_alpha_get_public_offset | |
52 | PARAMS ((bfd *, asymbol *)); | |
b34976b6 | 53 | static bfd_boolean nlm_alpha_write_external |
252b5132 RH |
54 | PARAMS ((bfd *, bfd_size_type, asymbol *, struct reloc_and_sec *)); |
55 | \f | |
56 | /* Alpha NLM's have a prefix header before the standard NLM. This | |
57 | function reads it in, verifies the version, and seeks the bfd to | |
58 | the location before the regular NLM header. */ | |
59 | ||
b34976b6 | 60 | static bfd_boolean |
252b5132 RH |
61 | nlm_alpha_backend_object_p (abfd) |
62 | bfd *abfd; | |
63 | { | |
64 | struct nlm32_alpha_external_prefix_header s; | |
dc810e39 | 65 | file_ptr size; |
252b5132 | 66 | |
dc810e39 | 67 | if (bfd_bread ((PTR) &s, (bfd_size_type) sizeof s, abfd) != sizeof s) |
b34976b6 | 68 | return FALSE; |
252b5132 | 69 | |
dc810e39 | 70 | if (H_GET_32 (abfd, s.magic) != NLM32_ALPHA_MAGIC) |
b34976b6 | 71 | return FALSE; |
252b5132 RH |
72 | |
73 | /* FIXME: Should we check the format number? */ | |
74 | ||
75 | /* Skip to the end of the header. */ | |
dc810e39 | 76 | size = H_GET_32 (abfd, s.size); |
252b5132 | 77 | if (bfd_seek (abfd, size, SEEK_SET) != 0) |
b34976b6 | 78 | return FALSE; |
252b5132 | 79 | |
b34976b6 | 80 | return TRUE; |
252b5132 RH |
81 | } |
82 | ||
83 | /* Write out the prefix. */ | |
84 | ||
b34976b6 | 85 | static bfd_boolean |
252b5132 RH |
86 | nlm_alpha_write_prefix (abfd) |
87 | bfd *abfd; | |
88 | { | |
89 | struct nlm32_alpha_external_prefix_header s; | |
90 | ||
91 | memset (&s, 0, sizeof s); | |
dc810e39 AM |
92 | H_PUT_32 (abfd, NLM32_ALPHA_MAGIC, s.magic); |
93 | H_PUT_32 (abfd, 2, s.format); | |
94 | H_PUT_32 (abfd, sizeof s, s.size); | |
95 | if (bfd_bwrite ((PTR) &s, (bfd_size_type) sizeof s, abfd) != sizeof s) | |
b34976b6 AM |
96 | return FALSE; |
97 | return TRUE; | |
252b5132 RH |
98 | } |
99 | \f | |
100 | /* How to process the various reloc types. */ | |
101 | ||
102 | static reloc_howto_type nlm32_alpha_howto_table[] = | |
103 | { | |
104 | /* Reloc type 0 is ignored by itself. However, it appears after a | |
105 | GPDISP reloc to identify the location where the low order 16 bits | |
106 | of the gp register are loaded. */ | |
107 | HOWTO (ALPHA_R_IGNORE, /* type */ | |
108 | 0, /* rightshift */ | |
109 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
110 | 8, /* bitsize */ | |
b34976b6 | 111 | FALSE, /* pc_relative */ |
252b5132 RH |
112 | 0, /* bitpos */ |
113 | complain_overflow_dont, /* complain_on_overflow */ | |
114 | 0, /* special_function */ | |
115 | "IGNORE", /* name */ | |
b34976b6 | 116 | FALSE, /* partial_inplace */ |
252b5132 RH |
117 | 0, /* src_mask */ |
118 | 0, /* dst_mask */ | |
b34976b6 | 119 | FALSE), /* pcrel_offset */ |
252b5132 RH |
120 | |
121 | /* A 32 bit reference to a symbol. */ | |
122 | HOWTO (ALPHA_R_REFLONG, /* type */ | |
123 | 0, /* rightshift */ | |
124 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
125 | 32, /* bitsize */ | |
b34976b6 | 126 | FALSE, /* pc_relative */ |
252b5132 RH |
127 | 0, /* bitpos */ |
128 | complain_overflow_bitfield, /* complain_on_overflow */ | |
129 | 0, /* special_function */ | |
130 | "REFLONG", /* name */ | |
b34976b6 | 131 | TRUE, /* partial_inplace */ |
252b5132 RH |
132 | 0xffffffff, /* src_mask */ |
133 | 0xffffffff, /* dst_mask */ | |
b34976b6 | 134 | FALSE), /* pcrel_offset */ |
252b5132 RH |
135 | |
136 | /* A 64 bit reference to a symbol. */ | |
137 | HOWTO (ALPHA_R_REFQUAD, /* type */ | |
138 | 0, /* rightshift */ | |
139 | 4, /* size (0 = byte, 1 = short, 2 = long) */ | |
140 | 64, /* bitsize */ | |
b34976b6 | 141 | FALSE, /* pc_relative */ |
252b5132 RH |
142 | 0, /* bitpos */ |
143 | complain_overflow_bitfield, /* complain_on_overflow */ | |
144 | 0, /* special_function */ | |
145 | "REFQUAD", /* name */ | |
b34976b6 | 146 | TRUE, /* partial_inplace */ |
252b5132 RH |
147 | 0xffffffffffffffff, /* src_mask */ |
148 | 0xffffffffffffffff, /* dst_mask */ | |
b34976b6 | 149 | FALSE), /* pcrel_offset */ |
252b5132 RH |
150 | |
151 | /* A 32 bit GP relative offset. This is just like REFLONG except | |
152 | that when the value is used the value of the gp register will be | |
153 | added in. */ | |
154 | HOWTO (ALPHA_R_GPREL32, /* type */ | |
155 | 0, /* rightshift */ | |
156 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
157 | 32, /* bitsize */ | |
b34976b6 | 158 | FALSE, /* pc_relative */ |
252b5132 RH |
159 | 0, /* bitpos */ |
160 | complain_overflow_bitfield, /* complain_on_overflow */ | |
161 | 0, /* special_function */ | |
162 | "GPREL32", /* name */ | |
b34976b6 | 163 | TRUE, /* partial_inplace */ |
252b5132 RH |
164 | 0xffffffff, /* src_mask */ |
165 | 0xffffffff, /* dst_mask */ | |
b34976b6 | 166 | FALSE), /* pcrel_offset */ |
252b5132 RH |
167 | |
168 | /* Used for an instruction that refers to memory off the GP | |
169 | register. The offset is 16 bits of the 32 bit instruction. This | |
170 | reloc always seems to be against the .lita section. */ | |
171 | HOWTO (ALPHA_R_LITERAL, /* type */ | |
172 | 0, /* rightshift */ | |
173 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
174 | 16, /* bitsize */ | |
b34976b6 | 175 | FALSE, /* pc_relative */ |
252b5132 RH |
176 | 0, /* bitpos */ |
177 | complain_overflow_signed, /* complain_on_overflow */ | |
178 | 0, /* special_function */ | |
179 | "LITERAL", /* name */ | |
b34976b6 | 180 | TRUE, /* partial_inplace */ |
252b5132 RH |
181 | 0xffff, /* src_mask */ |
182 | 0xffff, /* dst_mask */ | |
b34976b6 | 183 | FALSE), /* pcrel_offset */ |
252b5132 RH |
184 | |
185 | /* This reloc only appears immediately following a LITERAL reloc. | |
186 | It identifies a use of the literal. It seems that the linker can | |
187 | use this to eliminate a portion of the .lita section. The symbol | |
188 | index is special: 1 means the literal address is in the base | |
189 | register of a memory format instruction; 2 means the literal | |
190 | address is in the byte offset register of a byte-manipulation | |
191 | instruction; 3 means the literal address is in the target | |
192 | register of a jsr instruction. This does not actually do any | |
193 | relocation. */ | |
194 | HOWTO (ALPHA_R_LITUSE, /* type */ | |
195 | 0, /* rightshift */ | |
196 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
197 | 32, /* bitsize */ | |
b34976b6 | 198 | FALSE, /* pc_relative */ |
252b5132 RH |
199 | 0, /* bitpos */ |
200 | complain_overflow_dont, /* complain_on_overflow */ | |
201 | 0, /* special_function */ | |
202 | "LITUSE", /* name */ | |
b34976b6 | 203 | FALSE, /* partial_inplace */ |
252b5132 RH |
204 | 0, /* src_mask */ |
205 | 0, /* dst_mask */ | |
b34976b6 | 206 | FALSE), /* pcrel_offset */ |
252b5132 RH |
207 | |
208 | /* Load the gp register. This is always used for a ldah instruction | |
209 | which loads the upper 16 bits of the gp register. The next reloc | |
210 | will be an IGNORE reloc which identifies the location of the lda | |
211 | instruction which loads the lower 16 bits. The symbol index of | |
212 | the GPDISP instruction appears to actually be the number of bytes | |
213 | between the ldah and lda instructions. This gives two different | |
214 | ways to determine where the lda instruction is; I don't know why | |
215 | both are used. The value to use for the relocation is the | |
216 | difference between the GP value and the current location; the | |
217 | load will always be done against a register holding the current | |
218 | address. */ | |
219 | HOWTO (ALPHA_R_GPDISP, /* type */ | |
220 | 16, /* rightshift */ | |
221 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
222 | 16, /* bitsize */ | |
b34976b6 | 223 | TRUE, /* pc_relative */ |
252b5132 RH |
224 | 0, /* bitpos */ |
225 | complain_overflow_dont, /* complain_on_overflow */ | |
226 | 0, /* special_function */ | |
227 | "GPDISP", /* name */ | |
b34976b6 | 228 | TRUE, /* partial_inplace */ |
252b5132 RH |
229 | 0xffff, /* src_mask */ |
230 | 0xffff, /* dst_mask */ | |
b34976b6 | 231 | TRUE), /* pcrel_offset */ |
252b5132 RH |
232 | |
233 | /* A 21 bit branch. The native assembler generates these for | |
234 | branches within the text segment, and also fills in the PC | |
235 | relative offset in the instruction. It seems to me that this | |
236 | reloc, unlike the others, is not partial_inplace. */ | |
237 | HOWTO (ALPHA_R_BRADDR, /* type */ | |
238 | 2, /* rightshift */ | |
239 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
240 | 21, /* bitsize */ | |
b34976b6 | 241 | TRUE, /* pc_relative */ |
252b5132 RH |
242 | 0, /* bitpos */ |
243 | complain_overflow_signed, /* complain_on_overflow */ | |
244 | 0, /* special_function */ | |
245 | "BRADDR", /* name */ | |
b34976b6 | 246 | FALSE, /* partial_inplace */ |
252b5132 RH |
247 | 0, /* src_mask */ |
248 | 0x1fffff, /* dst_mask */ | |
b34976b6 | 249 | FALSE), /* pcrel_offset */ |
252b5132 RH |
250 | |
251 | /* A hint for a jump to a register. */ | |
252 | HOWTO (ALPHA_R_HINT, /* type */ | |
253 | 2, /* rightshift */ | |
254 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
255 | 14, /* bitsize */ | |
b34976b6 | 256 | FALSE, /* pc_relative */ |
252b5132 RH |
257 | 0, /* bitpos */ |
258 | complain_overflow_dont, /* complain_on_overflow */ | |
259 | 0, /* special_function */ | |
260 | "HINT", /* name */ | |
b34976b6 | 261 | TRUE, /* partial_inplace */ |
252b5132 RH |
262 | 0x3fff, /* src_mask */ |
263 | 0x3fff, /* dst_mask */ | |
b34976b6 | 264 | FALSE), /* pcrel_offset */ |
252b5132 RH |
265 | |
266 | /* 16 bit PC relative offset. */ | |
267 | HOWTO (ALPHA_R_SREL16, /* type */ | |
268 | 0, /* rightshift */ | |
269 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
270 | 16, /* bitsize */ | |
b34976b6 | 271 | TRUE, /* pc_relative */ |
252b5132 RH |
272 | 0, /* bitpos */ |
273 | complain_overflow_signed, /* complain_on_overflow */ | |
274 | 0, /* special_function */ | |
275 | "SREL16", /* name */ | |
b34976b6 | 276 | TRUE, /* partial_inplace */ |
252b5132 RH |
277 | 0xffff, /* src_mask */ |
278 | 0xffff, /* dst_mask */ | |
b34976b6 | 279 | FALSE), /* pcrel_offset */ |
252b5132 RH |
280 | |
281 | /* 32 bit PC relative offset. */ | |
282 | HOWTO (ALPHA_R_SREL32, /* type */ | |
283 | 0, /* rightshift */ | |
284 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
285 | 32, /* bitsize */ | |
b34976b6 | 286 | TRUE, /* pc_relative */ |
252b5132 RH |
287 | 0, /* bitpos */ |
288 | complain_overflow_signed, /* complain_on_overflow */ | |
289 | 0, /* special_function */ | |
290 | "SREL32", /* name */ | |
b34976b6 | 291 | TRUE, /* partial_inplace */ |
252b5132 RH |
292 | 0xffffffff, /* src_mask */ |
293 | 0xffffffff, /* dst_mask */ | |
b34976b6 | 294 | FALSE), /* pcrel_offset */ |
252b5132 RH |
295 | |
296 | /* A 64 bit PC relative offset. */ | |
297 | HOWTO (ALPHA_R_SREL64, /* type */ | |
298 | 0, /* rightshift */ | |
299 | 4, /* size (0 = byte, 1 = short, 2 = long) */ | |
300 | 64, /* bitsize */ | |
b34976b6 | 301 | TRUE, /* pc_relative */ |
252b5132 RH |
302 | 0, /* bitpos */ |
303 | complain_overflow_signed, /* complain_on_overflow */ | |
304 | 0, /* special_function */ | |
305 | "SREL64", /* name */ | |
b34976b6 | 306 | TRUE, /* partial_inplace */ |
252b5132 RH |
307 | 0xffffffffffffffff, /* src_mask */ |
308 | 0xffffffffffffffff, /* dst_mask */ | |
b34976b6 | 309 | FALSE), /* pcrel_offset */ |
252b5132 RH |
310 | |
311 | /* Push a value on the reloc evaluation stack. */ | |
312 | HOWTO (ALPHA_R_OP_PUSH, /* type */ | |
313 | 0, /* rightshift */ | |
314 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
315 | 0, /* bitsize */ | |
b34976b6 | 316 | FALSE, /* pc_relative */ |
252b5132 RH |
317 | 0, /* bitpos */ |
318 | complain_overflow_dont, /* complain_on_overflow */ | |
319 | 0, /* special_function */ | |
320 | "OP_PUSH", /* name */ | |
b34976b6 | 321 | FALSE, /* partial_inplace */ |
252b5132 RH |
322 | 0, /* src_mask */ |
323 | 0, /* dst_mask */ | |
b34976b6 | 324 | FALSE), /* pcrel_offset */ |
252b5132 RH |
325 | |
326 | /* Store the value from the stack at the given address. Store it in | |
327 | a bitfield of size r_size starting at bit position r_offset. */ | |
328 | HOWTO (ALPHA_R_OP_STORE, /* type */ | |
329 | 0, /* rightshift */ | |
330 | 4, /* size (0 = byte, 1 = short, 2 = long) */ | |
331 | 64, /* bitsize */ | |
b34976b6 | 332 | FALSE, /* pc_relative */ |
252b5132 RH |
333 | 0, /* bitpos */ |
334 | complain_overflow_dont, /* complain_on_overflow */ | |
335 | 0, /* special_function */ | |
336 | "OP_STORE", /* name */ | |
b34976b6 | 337 | FALSE, /* partial_inplace */ |
252b5132 RH |
338 | 0, /* src_mask */ |
339 | 0xffffffffffffffff, /* dst_mask */ | |
b34976b6 | 340 | FALSE), /* pcrel_offset */ |
252b5132 RH |
341 | |
342 | /* Subtract the reloc address from the value on the top of the | |
343 | relocation stack. */ | |
344 | HOWTO (ALPHA_R_OP_PSUB, /* type */ | |
345 | 0, /* rightshift */ | |
346 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
347 | 0, /* bitsize */ | |
b34976b6 | 348 | FALSE, /* pc_relative */ |
252b5132 RH |
349 | 0, /* bitpos */ |
350 | complain_overflow_dont, /* complain_on_overflow */ | |
351 | 0, /* special_function */ | |
352 | "OP_PSUB", /* name */ | |
b34976b6 | 353 | FALSE, /* partial_inplace */ |
252b5132 RH |
354 | 0, /* src_mask */ |
355 | 0, /* dst_mask */ | |
b34976b6 | 356 | FALSE), /* pcrel_offset */ |
252b5132 RH |
357 | |
358 | /* Shift the value on the top of the relocation stack right by the | |
359 | given value. */ | |
360 | HOWTO (ALPHA_R_OP_PRSHIFT, /* type */ | |
361 | 0, /* rightshift */ | |
362 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
363 | 0, /* bitsize */ | |
b34976b6 | 364 | FALSE, /* pc_relative */ |
252b5132 RH |
365 | 0, /* bitpos */ |
366 | complain_overflow_dont, /* complain_on_overflow */ | |
367 | 0, /* special_function */ | |
368 | "OP_PRSHIFT", /* name */ | |
b34976b6 | 369 | FALSE, /* partial_inplace */ |
252b5132 RH |
370 | 0, /* src_mask */ |
371 | 0, /* dst_mask */ | |
b34976b6 | 372 | FALSE), /* pcrel_offset */ |
252b5132 RH |
373 | |
374 | /* Adjust the GP value for a new range in the object file. */ | |
375 | HOWTO (ALPHA_R_GPVALUE, /* type */ | |
376 | 0, /* rightshift */ | |
377 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
378 | 0, /* bitsize */ | |
b34976b6 | 379 | FALSE, /* pc_relative */ |
252b5132 RH |
380 | 0, /* bitpos */ |
381 | complain_overflow_dont, /* complain_on_overflow */ | |
382 | 0, /* special_function */ | |
383 | "GPVALUE", /* name */ | |
b34976b6 | 384 | FALSE, /* partial_inplace */ |
252b5132 RH |
385 | 0, /* src_mask */ |
386 | 0, /* dst_mask */ | |
b34976b6 | 387 | FALSE) /* pcrel_offset */ |
252b5132 RH |
388 | }; |
389 | ||
390 | static reloc_howto_type nlm32_alpha_nw_howto = | |
391 | HOWTO (ALPHA_R_NW_RELOC, /* type */ | |
392 | 0, /* rightshift */ | |
393 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
394 | 0, /* bitsize */ | |
b34976b6 | 395 | FALSE, /* pc_relative */ |
252b5132 RH |
396 | 0, /* bitpos */ |
397 | complain_overflow_dont, /* complain_on_overflow */ | |
398 | 0, /* special_function */ | |
399 | "NW_RELOC", /* name */ | |
b34976b6 | 400 | FALSE, /* partial_inplace */ |
252b5132 RH |
401 | 0, /* src_mask */ |
402 | 0, /* dst_mask */ | |
b34976b6 | 403 | FALSE); /* pcrel_offset */ |
252b5132 RH |
404 | |
405 | /* Read an Alpha NLM reloc. This routine keeps some static data which | |
406 | it uses when handling local relocs. This only works correctly | |
407 | because all the local relocs are read at once. */ | |
408 | ||
b34976b6 | 409 | static bfd_boolean |
252b5132 RH |
410 | nlm_alpha_read_reloc (abfd, sym, secp, rel) |
411 | bfd *abfd; | |
412 | nlmNAME(symbol_type) *sym; | |
413 | asection **secp; | |
414 | arelent *rel; | |
415 | { | |
416 | static bfd_vma gp_value; | |
417 | static bfd_vma lita_address; | |
418 | struct nlm32_alpha_external_reloc ext; | |
419 | bfd_vma r_vaddr; | |
420 | long r_symndx; | |
421 | int r_type, r_extern, r_offset, r_size; | |
422 | asection *code_sec, *data_sec; | |
423 | ||
424 | /* Read the reloc from the file. */ | |
dc810e39 | 425 | if (bfd_bread (&ext, (bfd_size_type) sizeof ext, abfd) != sizeof ext) |
b34976b6 | 426 | return FALSE; |
252b5132 RH |
427 | |
428 | /* Swap in the reloc information. */ | |
dc810e39 AM |
429 | r_vaddr = H_GET_64 (abfd, ext.r_vaddr); |
430 | r_symndx = H_GET_32 (abfd, ext.r_symndx); | |
252b5132 RH |
431 | |
432 | BFD_ASSERT (bfd_little_endian (abfd)); | |
433 | ||
434 | r_type = ((ext.r_bits[0] & RELOC_BITS0_TYPE_LITTLE) | |
435 | >> RELOC_BITS0_TYPE_SH_LITTLE); | |
436 | r_extern = (ext.r_bits[1] & RELOC_BITS1_EXTERN_LITTLE) != 0; | |
437 | r_offset = ((ext.r_bits[1] & RELOC_BITS1_OFFSET_LITTLE) | |
438 | >> RELOC_BITS1_OFFSET_SH_LITTLE); | |
439 | /* Ignore the reserved bits. */ | |
440 | r_size = ((ext.r_bits[3] & RELOC_BITS3_SIZE_LITTLE) | |
441 | >> RELOC_BITS3_SIZE_SH_LITTLE); | |
442 | ||
443 | /* Fill in the BFD arelent structure. */ | |
444 | code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME); | |
445 | data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME); | |
446 | if (r_extern) | |
447 | { | |
448 | /* External relocations are only used for imports. */ | |
449 | BFD_ASSERT (sym != NULL); | |
450 | /* We don't need to set sym_ptr_ptr for this case. It is set in | |
451 | nlm_canonicalize_reloc. */ | |
452 | rel->sym_ptr_ptr = NULL; | |
453 | rel->addend = 0; | |
454 | } | |
455 | else | |
456 | { | |
457 | /* Internal relocations are only used for local relocation | |
458 | fixups. If they are not NW_RELOC or GPDISP or IGNORE, they | |
459 | must be against .text or .data. */ | |
460 | BFD_ASSERT (r_type == ALPHA_R_NW_RELOC || sym == NULL); | |
461 | if (r_type == ALPHA_R_NW_RELOC | |
462 | || r_type == ALPHA_R_GPDISP | |
463 | || r_type == ALPHA_R_IGNORE) | |
464 | { | |
465 | rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; | |
466 | rel->addend = 0; | |
467 | } | |
468 | else if (r_symndx == ALPHA_RELOC_SECTION_TEXT) | |
469 | { | |
470 | rel->sym_ptr_ptr = code_sec->symbol_ptr_ptr; | |
471 | BFD_ASSERT (bfd_get_section_vma (abfd, code_sec) == 0); | |
472 | rel->addend = 0; | |
473 | } | |
474 | else if (r_symndx == ALPHA_RELOC_SECTION_DATA) | |
475 | { | |
476 | rel->sym_ptr_ptr = data_sec->symbol_ptr_ptr; | |
477 | rel->addend = - bfd_get_section_vma (abfd, data_sec); | |
478 | } | |
479 | else | |
480 | { | |
481 | BFD_ASSERT (0); | |
482 | rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; | |
483 | rel->addend = 0; | |
484 | } | |
485 | } | |
486 | ||
487 | /* We use the address to determine whether the reloc is in the .text | |
488 | or .data section. R_NW_RELOC relocs don't really have a section, | |
489 | so we put them in .text. */ | |
490 | if (r_type == ALPHA_R_NW_RELOC | |
491 | || r_vaddr < bfd_section_size (abfd, code_sec)) | |
492 | { | |
493 | *secp = code_sec; | |
494 | rel->address = r_vaddr; | |
495 | } | |
496 | else | |
497 | { | |
498 | *secp = data_sec; | |
499 | rel->address = r_vaddr - bfd_section_size (abfd, code_sec); | |
500 | } | |
501 | ||
502 | /* We must adjust the addend based on the type. */ | |
503 | BFD_ASSERT ((r_type >= 0 && r_type <= ALPHA_R_GPVALUE) | |
504 | || r_type == ALPHA_R_NW_RELOC); | |
505 | ||
506 | switch (r_type) | |
507 | { | |
508 | case ALPHA_R_BRADDR: | |
509 | case ALPHA_R_SREL16: | |
510 | case ALPHA_R_SREL32: | |
511 | case ALPHA_R_SREL64: | |
512 | /* The PC relative relocs do not seem to use the section VMA as | |
513 | a negative addend. */ | |
514 | rel->addend = 0; | |
515 | break; | |
516 | ||
517 | case ALPHA_R_GPREL32: | |
518 | /* Copy the gp value for this object file into the addend, to | |
519 | ensure that we are not confused by the linker. */ | |
520 | if (! r_extern) | |
521 | rel->addend += gp_value; | |
522 | break; | |
523 | ||
524 | case ALPHA_R_LITERAL: | |
525 | BFD_ASSERT (! r_extern); | |
526 | rel->addend += lita_address; | |
527 | break; | |
528 | ||
529 | case ALPHA_R_LITUSE: | |
530 | case ALPHA_R_GPDISP: | |
531 | /* The LITUSE and GPDISP relocs do not use a symbol, or an | |
532 | addend, but they do use a special code. Put this code in the | |
533 | addend field. */ | |
534 | rel->addend = r_symndx; | |
535 | rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; | |
536 | break; | |
537 | ||
538 | case ALPHA_R_OP_STORE: | |
539 | /* The STORE reloc needs the size and offset fields. We store | |
540 | them in the addend. */ | |
541 | BFD_ASSERT (r_offset < 256 && r_size < 256); | |
542 | rel->addend = (r_offset << 8) + r_size; | |
543 | break; | |
544 | ||
545 | case ALPHA_R_OP_PUSH: | |
546 | case ALPHA_R_OP_PSUB: | |
547 | case ALPHA_R_OP_PRSHIFT: | |
548 | /* The PUSH, PSUB and PRSHIFT relocs do not actually use an | |
549 | address. I believe that the address supplied is really an | |
550 | addend. */ | |
551 | rel->addend = r_vaddr; | |
552 | break; | |
553 | ||
554 | case ALPHA_R_GPVALUE: | |
555 | /* Record the new gp value. */ | |
556 | gp_value += r_symndx; | |
557 | rel->addend = gp_value; | |
558 | break; | |
559 | ||
560 | case ALPHA_R_IGNORE: | |
561 | /* If the type is ALPHA_R_IGNORE, make sure this is a reference | |
562 | to the absolute section so that the reloc is ignored. For | |
563 | some reason the address of this reloc type is not adjusted by | |
564 | the section vma. We record the gp value for this object file | |
565 | here, for convenience when doing the GPDISP relocation. */ | |
566 | rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; | |
567 | rel->address = r_vaddr; | |
568 | rel->addend = gp_value; | |
569 | break; | |
570 | ||
571 | case ALPHA_R_NW_RELOC: | |
572 | /* If this is SETGP, we set the addend to 0. Otherwise we set | |
573 | the addend to the size of the .lita section (this is | |
574 | r_symndx) plus 1. We have already set the address of the | |
575 | reloc to r_vaddr. */ | |
576 | if (r_size == ALPHA_R_NW_RELOC_SETGP) | |
577 | { | |
578 | gp_value = r_vaddr; | |
579 | rel->addend = 0; | |
580 | } | |
581 | else if (r_size == ALPHA_R_NW_RELOC_LITA) | |
582 | { | |
583 | lita_address = r_vaddr; | |
584 | rel->addend = r_symndx + 1; | |
585 | } | |
586 | else | |
587 | BFD_ASSERT (0); | |
588 | rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; | |
589 | break; | |
590 | ||
591 | default: | |
592 | break; | |
593 | } | |
594 | ||
595 | if (r_type == ALPHA_R_NW_RELOC) | |
596 | rel->howto = &nlm32_alpha_nw_howto; | |
597 | else | |
598 | rel->howto = &nlm32_alpha_howto_table[r_type]; | |
599 | ||
b34976b6 | 600 | return TRUE; |
252b5132 RH |
601 | } |
602 | ||
603 | /* Mangle Alpha NLM relocs for output. */ | |
604 | ||
b34976b6 | 605 | static bfd_boolean |
252b5132 | 606 | nlm_alpha_mangle_relocs (abfd, sec, data, offset, count) |
56fc028e AJ |
607 | bfd *abfd ATTRIBUTE_UNUSED; |
608 | asection *sec ATTRIBUTE_UNUSED; | |
0f867abe | 609 | const PTR data ATTRIBUTE_UNUSED; |
56fc028e AJ |
610 | bfd_vma offset ATTRIBUTE_UNUSED; |
611 | bfd_size_type count ATTRIBUTE_UNUSED; | |
252b5132 | 612 | { |
b34976b6 | 613 | return TRUE; |
252b5132 RH |
614 | } |
615 | ||
616 | /* Read an ALPHA NLM import record */ | |
617 | ||
b34976b6 | 618 | static bfd_boolean |
252b5132 RH |
619 | nlm_alpha_read_import (abfd, sym) |
620 | bfd *abfd; | |
621 | nlmNAME(symbol_type) *sym; | |
622 | { | |
623 | struct nlm_relent *nlm_relocs; /* relocation records for symbol */ | |
624 | bfd_size_type rcount; /* number of relocs */ | |
625 | bfd_byte temp[NLM_TARGET_LONG_SIZE]; /* temporary 32-bit value */ | |
626 | unsigned char symlength; /* length of symbol name */ | |
627 | char *name; | |
dc810e39 | 628 | bfd_size_type amt; |
252b5132 | 629 | |
dc810e39 | 630 | if (bfd_bread ((PTR) &symlength, (bfd_size_type) sizeof (symlength), abfd) |
252b5132 | 631 | != sizeof (symlength)) |
b34976b6 | 632 | return FALSE; |
252b5132 | 633 | sym -> symbol.the_bfd = abfd; |
dc810e39 | 634 | name = bfd_alloc (abfd, (bfd_size_type) symlength + 1); |
252b5132 | 635 | if (name == NULL) |
b34976b6 | 636 | return FALSE; |
dc810e39 | 637 | if (bfd_bread (name, (bfd_size_type) symlength, abfd) != symlength) |
b34976b6 | 638 | return FALSE; |
252b5132 RH |
639 | name[symlength] = '\0'; |
640 | sym -> symbol.name = name; | |
641 | sym -> symbol.flags = 0; | |
642 | sym -> symbol.value = 0; | |
643 | sym -> symbol.section = bfd_und_section_ptr; | |
dc810e39 AM |
644 | if (bfd_bread ((PTR) temp, (bfd_size_type) sizeof (temp), abfd) |
645 | != sizeof (temp)) | |
b34976b6 | 646 | return FALSE; |
dc810e39 AM |
647 | rcount = H_GET_32 (abfd, temp); |
648 | amt = rcount * sizeof (struct nlm_relent); | |
649 | nlm_relocs = (struct nlm_relent *) bfd_alloc (abfd, amt); | |
252b5132 | 650 | if (!nlm_relocs) |
b34976b6 | 651 | return FALSE; |
252b5132 RH |
652 | sym -> relocs = nlm_relocs; |
653 | sym -> rcnt = 0; | |
654 | while (sym -> rcnt < rcount) | |
655 | { | |
656 | asection *section; | |
1518639e | 657 | |
82e51918 | 658 | if (! nlm_alpha_read_reloc (abfd, sym, §ion, &nlm_relocs -> reloc)) |
b34976b6 | 659 | return FALSE; |
252b5132 RH |
660 | nlm_relocs -> section = section; |
661 | nlm_relocs++; | |
662 | sym -> rcnt++; | |
663 | } | |
664 | ||
b34976b6 | 665 | return TRUE; |
252b5132 RH |
666 | } |
667 | ||
668 | /* Write an Alpha NLM reloc. */ | |
669 | ||
b34976b6 | 670 | static bfd_boolean |
252b5132 RH |
671 | nlm_alpha_write_import (abfd, sec, rel) |
672 | bfd *abfd; | |
673 | asection *sec; | |
674 | arelent *rel; | |
675 | { | |
676 | asymbol *sym; | |
677 | bfd_vma r_vaddr; | |
678 | long r_symndx; | |
679 | int r_type, r_extern, r_offset, r_size; | |
680 | struct nlm32_alpha_external_reloc ext; | |
681 | ||
682 | sym = *rel->sym_ptr_ptr; | |
683 | ||
684 | /* Get values for the relocation fields. */ | |
685 | r_type = rel->howto->type; | |
686 | if (r_type != ALPHA_R_NW_RELOC) | |
687 | { | |
688 | r_vaddr = bfd_get_section_vma (abfd, sec) + rel->address; | |
689 | if ((sec->flags & SEC_CODE) == 0) | |
690 | r_vaddr += bfd_section_size (abfd, | |
691 | bfd_get_section_by_name (abfd, | |
692 | NLM_CODE_NAME)); | |
693 | if (bfd_is_und_section (bfd_get_section (sym))) | |
694 | { | |
695 | r_extern = 1; | |
696 | r_symndx = 0; | |
697 | } | |
698 | else | |
699 | { | |
700 | r_extern = 0; | |
701 | if (bfd_get_section_flags (abfd, bfd_get_section (sym)) & SEC_CODE) | |
702 | r_symndx = ALPHA_RELOC_SECTION_TEXT; | |
703 | else | |
704 | r_symndx = ALPHA_RELOC_SECTION_DATA; | |
705 | } | |
706 | r_offset = 0; | |
707 | r_size = 0; | |
708 | ||
709 | switch (r_type) | |
710 | { | |
711 | case ALPHA_R_LITUSE: | |
712 | case ALPHA_R_GPDISP: | |
713 | r_symndx = rel->addend; | |
714 | break; | |
715 | ||
716 | case ALPHA_R_OP_STORE: | |
717 | r_size = rel->addend & 0xff; | |
718 | r_offset = (rel->addend >> 8) & 0xff; | |
719 | break; | |
720 | ||
721 | case ALPHA_R_OP_PUSH: | |
722 | case ALPHA_R_OP_PSUB: | |
723 | case ALPHA_R_OP_PRSHIFT: | |
724 | r_vaddr = rel->addend; | |
725 | break; | |
726 | ||
727 | case ALPHA_R_IGNORE: | |
728 | r_vaddr = rel->address; | |
729 | break; | |
730 | ||
731 | default: | |
732 | break; | |
733 | } | |
734 | } | |
735 | else | |
736 | { | |
737 | /* r_type == ALPHA_R_NW_RELOC */ | |
738 | r_vaddr = rel->address; | |
739 | if (rel->addend == 0) | |
740 | { | |
741 | r_symndx = 0; | |
742 | r_size = ALPHA_R_NW_RELOC_SETGP; | |
743 | } | |
744 | else | |
745 | { | |
746 | r_symndx = rel->addend - 1; | |
747 | r_size = ALPHA_R_NW_RELOC_LITA; | |
748 | } | |
749 | r_extern = 0; | |
750 | r_offset = 0; | |
751 | } | |
752 | ||
753 | /* Swap out the relocation fields. */ | |
dc810e39 AM |
754 | H_PUT_64 (abfd, r_vaddr, ext.r_vaddr); |
755 | H_PUT_32 (abfd, r_symndx, ext.r_symndx); | |
252b5132 RH |
756 | |
757 | BFD_ASSERT (bfd_little_endian (abfd)); | |
758 | ||
759 | ext.r_bits[0] = ((r_type << RELOC_BITS0_TYPE_SH_LITTLE) | |
760 | & RELOC_BITS0_TYPE_LITTLE); | |
761 | ext.r_bits[1] = ((r_extern ? RELOC_BITS1_EXTERN_LITTLE : 0) | |
762 | | ((r_offset << RELOC_BITS1_OFFSET_SH_LITTLE) | |
763 | & RELOC_BITS1_OFFSET_LITTLE)); | |
764 | ext.r_bits[2] = 0; | |
765 | ext.r_bits[3] = ((r_size << RELOC_BITS3_SIZE_SH_LITTLE) | |
766 | & RELOC_BITS3_SIZE_LITTLE); | |
767 | ||
768 | /* Write out the relocation. */ | |
dc810e39 | 769 | if (bfd_bwrite (&ext, (bfd_size_type) sizeof ext, abfd) != sizeof ext) |
b34976b6 | 770 | return FALSE; |
252b5132 | 771 | |
b34976b6 | 772 | return TRUE; |
252b5132 RH |
773 | } |
774 | \f | |
775 | /* Alpha NetWare does not use the high bit to determine whether a | |
776 | public symbol is in the code segment or the data segment. Instead, | |
777 | it just uses the address. The set_public_section and | |
778 | get_public_offset routines override the default code which uses the | |
779 | high bit. */ | |
780 | ||
781 | /* Set the section for a public symbol. */ | |
782 | ||
b34976b6 | 783 | static bfd_boolean |
252b5132 RH |
784 | nlm_alpha_set_public_section (abfd, sym) |
785 | bfd *abfd; | |
786 | nlmNAME(symbol_type) *sym; | |
787 | { | |
788 | asection *code_sec, *data_sec; | |
789 | ||
790 | code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME); | |
791 | data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME); | |
792 | if (sym->symbol.value < bfd_section_size (abfd, code_sec)) | |
793 | { | |
794 | sym->symbol.section = code_sec; | |
795 | sym->symbol.flags |= BSF_FUNCTION; | |
796 | } | |
797 | else | |
798 | { | |
799 | sym->symbol.section = data_sec; | |
800 | sym->symbol.value -= bfd_section_size (abfd, code_sec); | |
801 | /* The data segment had better be aligned. */ | |
802 | BFD_ASSERT ((bfd_section_size (abfd, code_sec) & 0xf) == 0); | |
803 | } | |
b34976b6 | 804 | return TRUE; |
252b5132 RH |
805 | } |
806 | ||
807 | /* Get the offset to write out for a public symbol. */ | |
808 | ||
809 | static bfd_vma | |
810 | nlm_alpha_get_public_offset (abfd, sym) | |
56fc028e | 811 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
812 | asymbol *sym; |
813 | { | |
814 | return bfd_asymbol_value (sym); | |
815 | } | |
816 | \f | |
817 | /* Write an Alpha NLM external symbol. */ | |
818 | ||
b34976b6 | 819 | static bfd_boolean |
252b5132 RH |
820 | nlm_alpha_write_external (abfd, count, sym, relocs) |
821 | bfd *abfd; | |
822 | bfd_size_type count; | |
823 | asymbol *sym; | |
824 | struct reloc_and_sec *relocs; | |
825 | { | |
5d964dfa | 826 | bfd_size_type i; |
252b5132 RH |
827 | bfd_byte len; |
828 | unsigned char temp[NLM_TARGET_LONG_SIZE]; | |
829 | arelent r; | |
830 | ||
831 | len = strlen (sym->name); | |
dc810e39 AM |
832 | if ((bfd_bwrite (&len, (bfd_size_type) sizeof (bfd_byte), abfd) |
833 | != sizeof (bfd_byte)) | |
834 | || bfd_bwrite (sym->name, (bfd_size_type) len, abfd) != len) | |
b34976b6 | 835 | return FALSE; |
252b5132 RH |
836 | |
837 | bfd_put_32 (abfd, count + 2, temp); | |
dc810e39 | 838 | if (bfd_bwrite (temp, (bfd_size_type) sizeof (temp), abfd) != sizeof (temp)) |
b34976b6 | 839 | return FALSE; |
252b5132 RH |
840 | |
841 | /* The first two relocs for each external symbol are the .lita | |
842 | address and the GP value. */ | |
843 | r.sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; | |
844 | r.howto = &nlm32_alpha_nw_howto; | |
845 | ||
846 | r.address = nlm_alpha_backend_data (abfd)->lita_address; | |
847 | r.addend = nlm_alpha_backend_data (abfd)->lita_size + 1; | |
82e51918 | 848 | if (! nlm_alpha_write_import (abfd, (asection *) NULL, &r)) |
b34976b6 | 849 | return FALSE; |
252b5132 RH |
850 | |
851 | r.address = nlm_alpha_backend_data (abfd)->gp; | |
852 | r.addend = 0; | |
82e51918 | 853 | if (! nlm_alpha_write_import (abfd, (asection *) NULL, &r)) |
b34976b6 | 854 | return FALSE; |
252b5132 RH |
855 | |
856 | for (i = 0; i < count; i++) | |
857 | { | |
82e51918 | 858 | if (! nlm_alpha_write_import (abfd, relocs[i].sec, relocs[i].rel)) |
b34976b6 | 859 | return FALSE; |
252b5132 RH |
860 | } |
861 | ||
b34976b6 | 862 | return TRUE; |
252b5132 RH |
863 | } |
864 | ||
865 | #include "nlmswap.h" | |
866 | ||
867 | static const struct nlm_backend_data nlm32_alpha_backend = | |
868 | { | |
869 | "NetWare Alpha Module \032", | |
870 | sizeof (Nlm32_alpha_External_Fixed_Header), | |
871 | sizeof (struct nlm32_alpha_external_prefix_header), | |
872 | bfd_arch_alpha, | |
873 | 0, | |
b34976b6 | 874 | TRUE, /* no uninitialized data permitted by Alpha NetWare. */ |
252b5132 RH |
875 | nlm_alpha_backend_object_p, |
876 | nlm_alpha_write_prefix, | |
877 | nlm_alpha_read_reloc, | |
878 | nlm_alpha_mangle_relocs, | |
879 | nlm_alpha_read_import, | |
880 | nlm_alpha_write_import, | |
881 | nlm_alpha_set_public_section, | |
882 | nlm_alpha_get_public_offset, | |
883 | nlm_swap_fixed_header_in, | |
884 | nlm_swap_fixed_header_out, | |
885 | nlm_alpha_write_external, | |
886 | 0, /* write_export */ | |
887 | }; | |
888 | ||
889 | #define TARGET_LITTLE_NAME "nlm32-alpha" | |
890 | #define TARGET_LITTLE_SYM nlmNAME(alpha_vec) | |
891 | #define TARGET_BACKEND_DATA &nlm32_alpha_backend | |
892 | ||
893 | #include "nlm-target.h" |